66-77 Bronco H4 Halogen and LED Headlight Installation Guide

Headlight upgrades are one of the most affordable modifications you can do to increase the safety and usability of a classic Bronco. Read on to find out how-to and see a few of our favorite options.

Overview of H4 Halogen and LED Headlights

Headlights are a critical component of a vehicle, contributing not only to visibility but also to safety. In recent years, there has been a shift from traditional halogen headlights to LED lights due to their efficiency, brightness, and durability. This article provides an overview of the two most common types of headlights: H4 halogen and LED, focusing on their features, installation, and benefits.

H4 Halogen Headlights

Halogen headlights, specifically the H4 type, have been a staple in the automotive industry for many years. They contain a tungsten filament encased in a halogen gas, which produces light when electrically charged.

• Affordability: Halogen lights are generally less expensive compared to newer technologies like LEDs.
• Ease of Installation: The video highlights how H4 halogen lights are easy to install and compatible with most vehicles using the included harness.

LED Headlights

LED headlights have become increasingly popular due to their brightness, energy efficiency, and longevity. These lights use semiconductors to emit light when an electric current passes through them.

• Energy Efficiency: LEDs use significantly less power than halogen lights, reducing strain on the vehicle’s electrical system.
• Longer Lifespan: LEDs last much longer than halogen bulbs, reducing the need for frequent replacements.
• Brightness and Focus: LEDs provide a brighter, whiter light that improves visibility, especially at night. The video demonstrates the halo feature of LED headlights, which can be connected to running lights for added functionality.

Installation Process

The video provides a step-by-step guide on how to install both H4 halogen and LED headlights using a relay harness (PN 1471):

1. Remove the Headlight Bezels and Retaining Ring: This step allows access to the existing headlights for replacement.
2. Wire the Relay Harness: The plug-and-play harness connects to the vehicle’s battery and headlight sockets. A built-in diode allows low beams to remain on with high beams, boosting brightness.
3. Final Setup: Mount the lights and test the system. Always disconnect the negative battery cable before starting any electrical work to avoid shorts.

Advantages of Using a Relay Harness

One of the major advantages covered in the video is the use of a relay harness. It manages the electrical load more efficiently, ensures both high and low beams can run together, and protects against electrical surges. The diode keeps both beams on simultaneously, which enhances nighttime visibility and safety.

Conclusion

Both H4 halogen and LED headlights offer unique benefits. Halogen lights are affordable and easy to install, while LEDs are brighter, longer-lasting, and more energy-efficient. The TOMS OFFROAD video provides a thorough walkthrough for installing either option, helping Bronco owners upgrade their lighting and boost road safety.